Journal
TETRAHEDRON
Volume 65, Issue 18, Pages 3728-3732Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2009.02.080
Keywords
High birefringence; Liquid crystals; Styrene monomer; Photoluminescence
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Funding
- National Science Foundation of China [20634010, 20574002, 20874002, 50743042]
- Science Research Fund of the Chinese Ministry of Education [20070420253]
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Three new liquid crystal asymmetrical styrene monomers bearing diacetylenes, naphthyl, and nitrogen-containing groups were successfully synthesized from 2-(bromoethynyl)-6-(hexyloxy)naphthalene, 4-(4-bromo-2-vinylphenyl)-2-methylbut-3-yn-2-ol, and derivatives of 4-ethynylaniline. The molecular structures of these compounds were confirmed by FIR, H-1 NMR spectroscopy, elemental analysis, and mass spectrometry. The liquid crystalline properties of monomers were characterized by differential scanning calorimetry and polarized light microscopy. Results indicated that all the compounds exhibited the nematic phase in liquid crystal state and super high optical birefringence of 0.5-0.8. The change of terminal nitrogen-containing group affected the birefringence values in the order of -N(CH3)(2)<-NH2<-NCS. Moreover, measurements using UV-vis and fluorescence spectroscopy showed their good photoluminescence properties and high quantum efficiency of 0.4-1.0. (C) 2009 Elsevier Ltd. All rights reserved.
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